Timing Controller Polarity Compensation for LCD Flicker Reduction
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Solution Overview
Problem
Liquid crystal display (LCD) apparatuses using temporal gamma mixing (TGM) schemes often experience moving artifacts and flicker due to differences in voltage gaps between high and low gamma voltages when polarity remains the same or is inverted, affecting display quality.
Innovation Solution
A timing controller with a polarity comparison part and compensation part that compares the polarity of data voltages between consecutive frames and compensates them using different look-up tables based on the comparison, ensuring consistent luminance and reducing response speed differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If temporal gamma mixing (TGM) scheme is employed to enhance visibility, then luminance contrast is improved, but moving artifacts and flicker appear due to voltage gap differences between high and low gamma voltages
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing compensation values in look-up tables (LUTs) before actual display operation. The timing controller stores different compensation values corresponding to different polarity combinations (same polarity, inverted polarity) in advance, and directly retrieves the appropriate compensation value during operation based on the current polarity state, eliminating the need for real-time calculation and enabling stable compensation.
Solution Approach 2:
The patent changes the parameter of data voltage by applying polarity-based compensation values retrieved from look-up tables. The timing controller adjusts the data voltage level differently depending on whether the polarity is the same or inverted between frames, thereby compensating for the voltage gap differences and eliminating moving artifacts while maintaining the luminance contrast benefits of TGM.
2Adaptability or versatility
If different voltage gaps are applied for same polarity and inverted polarity in TGM, then gamma mixing is achieved, but response speed difference causes moving artifacts
Solution Approach 1:
The patent applies local quality by providing different compensation values for different local conditions (polarity combinations). The look-up tables store specific compensation values tailored to each polarity scenario (same polarity, inverted polarity), allowing the system to apply the appropriate compensation locally based on the current polarity state, thereby addressing response speed differences without compromising gamma mixing capability.
3Device complexity
If data voltage is compensated using a single look-up table, then device complexity is reduced, but display quality deteriorates due to inability to account for polarity differences
Solution Approach 1:
The patent segments the compensation system into multiple look-up tables, each dedicated to a specific polarity combination (same polarity, inverted polarity). This segmentation allows the system to store and retrieve appropriate compensation values for different scenarios, improving display quality by accounting for polarity differences while maintaining relatively simple implementation through pre-computed tables.
Data Source
AI summary
A timing controller for a display apparatus includes a polarity comparison part and a compensation part. The polarity comparison part compares a first polarity of a first data voltage with a second polarity of a second data voltage, the first data voltage corresponding to a first pixel in a first frame and generated based on a first gamma voltage, the second data voltage corresponding to the first pixel in a second frame and generated based on a second gamma voltage. The compensation part compensates the second data voltage based on a first look-up table, if the first polarity is the same as the second polarity, and compensates the second data voltage based on a second look-up table, if the first polarity is different from the second polarity.